Improvement in pumps for hydraulic presses



D. C. STARKS. Pump for Hydraulic-Presses.,

P10162256, PatentedApril20,1875.

WW "I WITNESSES INVENTOR w Jags/l? Jmr.

ATTORNEY THE GRAPHIC C0.PHOTO LITH.39 801-1 PARK PLACEJLY.

DANIEL G. STARKS, OF HERMITAGE, NEW YORK.

IMPROVEMENT IN PUMPS FOR HYDRAULIC PRESSES.

Specification forming part of Letters Patent No. 162,256, dated April20, 1875; application filed March 10, 1875.

To all whom it may concern:

Be it known that I, DANIEL O. STARKS, of Hermitage, in the county of'Wyoming and State of New York, have invented certain new and usefulImprovements in Hydraulics and I do hereby declare that the following isa full, clear, and exact description thereof, which will enable othersskilled in the art to which it pertains to make and use the same,reference being had to the accompanying drawing, and to the letters ofreference marked thereon, which form a part of this specification:

The nature of my invention consists in the construction and arrangementof a hydraulic pump, to be used for any purpose desired, whereapplicable, will be hereinafter more fully set forth.

In the annexed drawing, Figure 1 is a vertical section, showing thepower as applied to cider-presses. Fig. 2 is a horizontal sectionalview.

A represents a cylinder of any suitable dimensions, provided with apiston, B, worked by hydraulic pressure, obtained by a single or doubleplunger force-pump. The cylinder of the pump is formed with two barrels,(J and D, orin other words, two cylinders are used, which are placedparallel with each othcrand containing respectively the plungers U andD. The barrels or cylinders O D are connected by pipes to a with thecylinder A, as shown. The plungers U D are connected to and operated bytwo cams, b b, on a drivingshaft, E, which is to be keptin motion byanysuitable or convenient power. The cylinders C D, as well as theirrespective plungers, are of unequal diameter. The larger plunger 0 iskept in operation, and, as it advances, forcing the water before it intothe cylinder A. and slowly raising the piston B therein. Just beforethis plunger completes its forward movement, at about the point as shownin Fig. 2 of the drawing, the smaller plunger D is thrown in gear by aclutch, d, operated by any suitable mechanical means, and the camoperating said smaller plunger being properly constructed, this plungerwill give a forcible final thrust, moving rapidly the entire length ofthe cylinder D, while the larger plunger 0 at the same time completesits stroke, thus pressing the piston B up to the desired point. Theclutch d should be so arranged and connected with the piston B, or themechanism operated thereby, that when the piston obtains a certainaltitude by the operation of the two plungers the clutch will be thrownout of gear. The hydraulic pump is controlled by means of asafety-valve, G, so arranged as to blow off at any desired pressure.This pressure is retained for any desired length of time, according tothe movement of a face-plate, H, with cam h attached to it, and saidface plate operated by cone-pulleys I I, with belt around them, drivenby gear from the main shaft E. These pulleys and face-plate are arrangedou suitable counter shafts, arranged in any convenient manner in theframe of the pump.

I am aware that a hydraulic press having two plungers of unequal size tooperate alternately at different times in the process of pressing, bythe shifting of a belt from one pulley to another, is not new, and I do,therefore, not claim such as my invention. .It will be seen that in mypump the large plunger operates first alone to a certain point withinits cylinder, and then the smaller plunger is automatically thrown ingear, so that while the larger plunger completes its stroke the smallerone is at the same time rapidly moved the entire length of its cylinderto give the final forcible thrust.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-- 1. In a hydraulic pump, thecombination of two plungers, G D, ofunequal size, the operating cams bb, and the automatically-operating clutch cl, whereby the smallerplunger is thrown in gear before the larger plunger has completed itsstroke, and both plungers then operate together at unequal speed tocomplete the movement, substantially as herein set forth.

2. The combination, with the cylinder A, of the safety-valve Gr,face-plate H, with cam h, and cone-pulleys I I, with their connectingbelt run by gearing from the main shaft, substantially as and for thepurposes herein set forth.

In testimony that I clahtreifgregoing as my own I affix my signature inp sence of two witnesses.

' DANIEL 0. STAR S. Witnesses J AMES L. BLODGET, S. A. EARMAN.

